package com.example.demo.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.example.demo.common.CustomException;
import com.example.demo.entity.Category;
import com.example.demo.entity.Dish;
import com.example.demo.entity.Setmeal;
import com.example.demo.mapper.CategoryMapper;
import com.example.demo.service.CategoryService;
import com.example.demo.service.DishService;
import com.example.demo.service.SetmealService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

    /**
     * @author LJM
     * @create 2022/4/16
     */
    @Service
    public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {


        @Autowired
        private DishService dishService;
        @Autowired
        private SetmealService setmealService;


        /**
         * 根据id删除 分类，删除之前需要进行判断是否有关联数据
         *
         * @param id
         */
        @Override
        public void remove(Long id) {


            LambdaQueryWrapper<Dish> dishLambdaQueryWrapper = new LambdaQueryWrapper<>();
            //添加查询条件，根据分类id进行查询
            dishLambdaQueryWrapper.eq(Dish::getCategoryId, id);
            int count1 = dishService.count(dishLambdaQueryWrapper);

            //查询当前分类是否关联了菜品，如果已经关联，抛出一个业务异常
            if (count1 > 0) {
                //已经关联菜品，抛出一个业务异常
                throw new CustomException("当前分类下关联了菜品，不能删除");
            }

            //查询当前分类是否关联了套餐，如果已经关联，抛出一个业务异常
            LambdaQueryWrapper<Setmeal> setmealLambdaQueryWrapper = new LambdaQueryWrapper<>();
            //添加查询条件，根据分类id进行查询
            setmealLambdaQueryWrapper.eq(Setmeal::getCategoryId, id);
            int count2 = setmealService.count();
            if (count2 > 0) {
                //已经关联套餐，抛出一个业务异常
                throw new CustomException("当前分类下关联了套餐，不能删除");
            }

            //正常删除分类
            super.removeById(id);

        }
    }



